Printing scale



April 27, 1943,

A. HAN

PRINTING SCALE Filed March 6, 1939 2 Sheets-Sheet l FIGJ.

L i* f a f@ 7 @if my April 27, 1943. A. HAHN 2,317,760

PRINTING SCALE Filed March G, 1959 Sheets-Sheet 2 //7 Ven fam @www-i;

Patented Apr. 27, 1943 PRDITING SCALE Arthur Hahn, Balingen, Germany;vested in the Alien Property Custodian Application March 6, 1939, SerialNo. 260,243 In Germany March 9, 1938 4 Claims.

The invention relates to a printing device for adjusting weightinclination weighing machines, in which the values of the weights to beplaced on by the weigher after the normal weighing range is exceeded arerecorded with the weight values of the normal range of the machine,which are determined by exploration of a disc bearing devices to beexplored, rotatable about an axis with the tilting weight device.

The known devices of this kind have the disadvantage that if too largeor too small an adjusting weight is placed on, i. e. if the feeler orexplorer for the disc is within the dead angle between the limits ofzero and the maximum load, either the figure 0 or the figurecorresponding to the maximum value of the disc is printed. There are nomeans for ensuring that the adjusting weights are placed on or taken offin the correct amount, and are taken into account in the printing.

The object of the invention is to remove this disadvantage. This iseffected according to the invention, in a weighing machine of the kindabove referred to, by the provision of a locking device for the drivingmeans of the printing mechanism, which device comes into operation -ifthe disc is brought outside the exploring position or range as a resultof too large or too small an adjusting weight being added. The lockingdevice is preferably under the control of the disc.

On the disc there is preferably provided, in the angle between thedevices for zero and maximum value, a raised or projecting part whichwhen the disc is out of exploring position as the result oi' too largeor too small an adjusting weight being added, lies in the path of afeeler moved by the driving means of the printing device, completemovement oi'V which ieeler is necessary for releasing the normallylocked driving means for the printing device.

According to a further feature of the invention the feeler moved by thedriving means of the printing mechanism serves to control a lockingpawl, which engages with play in the said driving means, and is liftedout of the driving means if the feeler executes a full operativemovement, but remains in engagement with the driving means if the raisedor projecting part on the disc prevents the complete movement of thefeeler.

The movement of the feeler co-operating with the raised part of the discis effected by the driving means of the printing mechanism preferablythrough the medium of a spring, and the locking pawl engaging in thedriving means of the printing mechanism is under the control of a springnormally holding 1t in engagement with the driving means, and of alinkage controlled by the feeler, the spring tending at the same time todraw the feeler into its rest position.

An embodiment of the invention is illustrated by Way of example in theaccompanying drawings, in which Figure 1 shows the measuring head of aninclination adjusting weight weighing machine in elevation, with part ofthe scale removed.

Figure 2 is a plan view of the printing device of the weighing machine,

Figure 3 is a section through the printing device on the line III-III ofFigure 2,

Figure 4 is a section through the printing device on the line IV-IV oiFigure 3.

On the axle I of the inclination system of the Weighing machine, whichsystem is known in itself, and is consequently not illustrated indetail, are rigidly mounted an indicator 3 movable over a scale 2, andthe disc 4 bearing devices to be explored. This disc is provided withdevices to be explored in a. manner likewise known per se. In theembodiment illustrated by way of example the disc has devices forhundreds, tens, and units- The devices for the hundreds consists ofsteps 5 formed at the periphery of the disc. The devices for the tensare formed by the step-wise onset outer edge 6 of a number of recesses 1corresponding to the hundreds devices, and the units devices are formedby the step-wise offset inner edge 8 of these recesses.

The exploration of the devices 5, S, 8 is eiected in the axial directionof the disc I by three stepwise offset feelers 9, I0 and II (Figure 2).'I'he feeler 9 serves for exploring the hundreds devices, the feeler I0for exploring the tens devices, and the feeler II for exploring theunits devices. Each feeler carries at its rear end an eye I2 to which issecured the one end of a spring I3, the other end of which engages atransverse rod I4 of the fixed frame I5 of the printing device, thesprings tending to draw the feelers towards the disc Each feeler carrieson its under side a projection I6. The projections I6 abut against atransverse rod Il of a slide I8 movable in the direction of the feelermovement. The slide is constructed, on its under-side, as a rack I9,which is in engagement with a gear-Wheel 20. See Figures 3 and 4. Thegear-wheel 20 is mounted on the axle 2|, which carries a secondgear-wheel 22, which is in engagement with a gear-wheel 25 on the shaft23 of the hand crank If the hand crank is rotated in the direction ofthe arrow Figure 3) then the gearwheel4 29 moves the slide i8 andtherewith the transverse rod |1 in the direction of the disc 4, so thatthe feelers 9, I0, Il are released and likewise move 'towards the discunder the iniiuence of the springs 3 and can register with the devices5, 6, 8 located before them at the time.

The feelers |D and |I transmit their exploring movement directly to thetype wheels 26, 21. See Figures 2 and 3. For this purpose the feelersIIJ and are constructed at their rear ends as racks 28, 29, which are inengagement with gear-Wheels 30, 3| on the shafts of the type wheels 26,21. The printing type wheels are displaced in accordance with themagnitude of the exploring movement of the feelers I0, Il which moveinthe "direction of the disc 4 until one of their steps strikes a stepof the disc.

TheV exploring movement of theqfeeler 9 for the hundredsis transmittedto the printing type wheel-32,which moreover is pre-adjustable todeiinitewvalues `in accordance with the adjusting weights added. Therack 33 serving for adjustment `of the printing type wheel 32, whichdevice is hingedabell crank lever 36 to which the adjusting weights arecoupled by means of the rod 31. YAccordingto the value of the adjustingweight, the bell crank lever 36 presses the rack 33 towards 'the rightin Figures 2 and 3 through the intermediary of roller 38; and therebyeiects a preadjustment vof the-printing type wheel 32 in accordance withthe adjusting weight which has vbeen added.v v v Thefeeler 9 has alateral projection 3,9, .and

on the upper side of the rack 33 thereare provided in the vicinity ofthis projection a number of projections 40, 4|, 42 which upon move-lment of the feeler 9 towards the disc 4 extendy into the path of theprojection 39.

It should be understood that when the weighing machine is operatingwithout additional -weights the projection 39 lies between theprojections 4| and 42. When only one additional Weight is used theprojection lies between the projections 4| and 42, and when twoadditional weights are used the position of the projections 40, 4| and42 relative to the projection 39 is that which is illustrated in Figure2. The particular means for effectingV relative movement between theelements-39, 4U, 4| and 42 so as to place them in the relative positionsstated according to the number of weights used is not illustrated indetail or claimed herein, this mechanism per se being covered in detail.in my copending application for U. S. Letters Patent, Serial NumberA308,277.

When the feelers 9, l0 and are released in the manner hereinbeforedescribed by the hand crank 24, said feelers move toward the disk 4, thefeeler 9 being moved by the lateral projection 39 and taking with it therack 33. Movement of the rack 33 serves to properly place the printingtype wheel 32.

After adjustment of the printing type wheels eiected by pressing a pieceof paper or the like lying on the printing plate 43 against the printingtype wheels. The printing plate 43 is arranged on the one end of adouble-armed pressure stirrup 45 rotatably mounted at 44, which stirrupis controlled by a cam 46. This cam is mounted on a shaft 41 whichcarries a gear wheel 48 which is in engagement with the gear wheel 25 onthe shaft 23 of the hand crank. Upon rotation of the hand crank 24 inthe direction of the arrow the cam 46 presses on the end of the pressurestirrup 45, which is provided with a roller 49, and presses the printingplate 43 against the printing type Wheels.

The object of the invention is to prevent printing if the dead angle a:of the disc 4, which corresponds to the dead angle y of the scale 2, islocated opposite the feelers 9, l0, Il. In order to achieve this theprinting device is held locked when the disc is in this position. Thelocking is effected by a locking pawl 50 which is mounted on the handcrank shaft 23 and is freely rotatable thereon, the pawl being normallyheld in engagement with a double cam 52 on the shaft 41, by a spring 5|.The double cam is provided with two recesses 53 and 54. The free end ofthe locking pawl 50 lies in the recess 53 extending over a certain partof the periphery of the cam. In the recess 54 lies a spring 55 whichextends through an opening of the frame of the printing device, and issecured to an angle feeler 51 pivoted at 55. The feeler is connected atits upper end by a rod 58 with one end of the spring 5|, the other endof which is anchored to the frame of the printing device. The rear endof the locking pawl 50 is pivoted to the rod 58 at 59.

If the hand crank 24 is rotated in the direction of the arrow, the freeend of the locking pawl 50 slides along in the recess 53 of the doublecam 52. At the same time the double cam presses the'spring 55 out of therecess 54 and therewith swings the angle feeler 51 in the direction ofthe disc 4. By this displacement of the feeler 51 the locking pawl 5U ismoved out of the recess 53 of the double cam 52 by the rod 58, so thatIn order'to prevent printing if the dead angle-1 :c of the disc isAloca-ted opposite the feel'ers 9, IIJ,

|I a raised part 60 is provided on the disc 4 over this angle, whichpart lies in front ofthe angle feeler 51 with the disc in the saidposition. If, with the disc in this position, the hand crank 24 isrotated, the free end of the angle feele'r 51 abuts against the raisedpart 60. The raised part therefore prevents the full deflection of theangle feeler, the result of which is that the locking pawl 5|) 'is notlifted out of the recess 53 of the double cam 52 by the rod 5B, butremains in engagement with the recess and prevents a further rotation ofthe hand crank 24.

The raised part 60, the extent of which corresponds to the dead angle ofthe disc, thus prevents the accomplishment of a printing operation solong as the dead angle of the disc lies opposite the feelers 9, i0 andas the result of excessive or insuicient load. In order to permit ofprinting, the weigher is obliged to add or remove an adjusting weightaccording to the circumstances; since it is only by the removal oraddition of an adjusting weight that the dead angle of the disc is movedinto a position in which the raised part 60 does not lie in frontv ofthe feelers 9, I0, 'I'he printing of false weighing results by means ofthe printing mechanism is thereby prevented.

I claim:

l. In a printing scale of the type wherein the value of the weight whichis added after the normal weighing range is exceeded, is printedtogether with the other weight values which are determined by the feelerexploration of a rotatable member formed with weight value indiciacorresponding to the normal weight values up to a dead angle between thezero point and the maximum load point; the provision of a printingmechanism for printing the weight of the mass being weighed, drivingmeans for the printing mechanism, a feeler device associated with saiddriving means, and means providing a control area associated with therotatable member of the weighing system and extending over the deadangle range and with which the feeler device cooperates for locking thedriving means of the printing mechanism, and said feeler device beingoperable to release the driving means of the printing mechanism when thearea on the movable part of the weighing system is out of the range ofthe said feeler device.

2. In a printing scale of the type wherein the value of the Weight whichis added after the normal weighing range is exceeded is printed,together with the other weight values which are determined by the feelerexploration of a rotatable disc formed with weight value indicia.corresponding to the normal weight values up to dead angle between theZero point and the ma;- imum load point; the provision of a printingmechanism for printing the weight of the macs being weighed, drivingmeans for the printing mechanism, a ieeler device associated with saiddriving means, and means providing a raised portion on the surface ofsaid disc over the dead angle range and against which the feeler de e isadapted to abut for locking the driving me(- s of the printingmechanism, and said feeler device being operable to release the drivingmeans of the printing mechanism when the said 'i portion is out of therange of said feeler d 3. In a printing' scale, as claimed in claim l,

eviee.

wherein a control lever for the driving means o the printing mechanismsimultaneously sei-v .rs the control lever for the feeler device whicheifects locking of the printing mechanism.

4. In a printing scale, as claimed in claim i, wherein a locking pawlengages the d means of the printing mechanism to lock the same andwherein spring means are provided for normally forcing said pawl intoengagement with the driving means but releasable there ern by operationof the feeler device when the con-- trol area on the movable part of theweighing system is out of range of the feeler device.

ARTHUR HAHN.

